I think people are often looking along the wrong lines when VW say they have implemented cost cutting.. 
The MK6 is superior to the MK5 in everyway... if only by a little bit. 
Can you feel the cost cutting on the MK6? I know I can, but I agree with it is a much better motor!! 
The cost cutting related to production techniques, and the cost of putting the car together as opposed to the actual cost of the materials used. With the MK5 there were more extras to add (i.e. arm rest, mfsw etc) and therefore just the organising of each car would have taken quite some time.
The only noticable cost cutting i can notice is lack of net in the boot, auto petrol release cap, gear lever, dials (which have a cheaper look).